Single flux, quantum B flip-flop and its possible applications

Author

Polonsky, S.V. ; Semenov, V.K. ; Kirichenko, A.F.

Author_Institution

Dept. of Phys., State Univ. of New York, Stony Brook, NY, USA

Volume

4

Issue

1

fYear

1994

fDate

3/1/1994 12:00:00 AM

Firstpage

9

Lastpage

18

Abstract

We are introducing a new subfamily of rapid single-flux-quantum (RSFQ) digital cells, based on a single B flip-flop template. The template can be considered as an SFQ flip-flop with up to 4 inputs and 6 outputs. Each input SFQ pulse can change the flip-flop´s internal state. Each output presents (in the form of SFQ pulses a specific logic function of the initial state of the cell and input signals. Simple connection of various inputs and/or outputs, combined with shortening or opening of certain branches of the template allows one to implement a variety of RSFQ cells with wide margins. Of these various RSFQ cells, we have designed and successfully tested the T1 cell (asynchronous toggle flip-flop with synchronous destructive readout), single-bit full adder, and single-bit stage of an up-down counter. Experimentally measured margins for dc power supply voltage for these circuits were /spl plusmn/24%, /spl plusmn/24%, and /spl plusmn/17%, respectively.<>

Keywords

adders; flip-flops; superconducting logic circuits; T1 cell; asynchronous toggle flip-flop; dc power supply voltage; initial state; input signals; internal state; rapid single-flux-quantum digital cells; shortening; single B flip-flop template; single flux quantum B flip-flop; single-bit full adder; single-bit stage; specific logic function; synchronous destructive readout; up-down counter; Adders; Circuit testing; Counting circuits; Flip-flops; Josephson junctions; Logic functions; Niobium; Power measurement; Power supplies; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.273059

Filename

273059